Metallurgical Characterization and Kinetics of Borided 34CrNiMo6 Steel
| Autor: | N. Ucar, M. Yigit, A. Calik |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Complementary and alternative medicine 0103 physical sciences Metallurgy Kinetics Pharmaceutical Science Pharmacology (medical) 02 engineering and technology 021001 nanoscience & nanotechnology 0210 nano-technology 01 natural sciences Characterization (materials science) |
| Zdroj: | Advances in Materials Science. 20:38-48 |
| ISSN: | 2083-4799 |
| DOI: | 10.2478/adms-2020-0021 |
| Popis: | Boriding of 34CrNiMo6 steel was performed in a solid medium consisting of Ekabor-II powders at 1123, 1173 and 1223 K for 2, 4 and 6 h. Morphological and kinetic examinations of the boride layers were carried out by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thicknesses of the boride layers ranged from 22±2.3 to 145±4.1 depending on boriding temperature and time. The hardness of boride layer was about 1857 HV0.1 after boriding for 6 h at 1223 K, while the hardness of the substrate was only around 238 HV0.1. Growth rate constants were found to be between 1.2×10−13 – 9.8×10−13 m2/s depending on temperature. The activation energy for boron diffusion was estimated as 239.4±8.6 kJ mol−1. This value was comparable to the activation energies reported for medium carbon steels in the literature. |
| Databáze: | OpenAIRE |
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